Merge 864e8090ba into 4623f878e0

README.md

@@ -90,7 +90,7 @@ To run on Android, check [Android_Guide](https://github.com/wangyu-/udp2raw/wiki
 ### Usage
 ```
 udp2raw-tunnel
-git version:4623f878e0    build date:Nov  3 2024 23:15:46
+git version:6e1df4b39f    build date:Oct 24 2017 09:21:15
 repository: https://github.com/wangyu-/udp2raw-tunnel
 
 usage:
@@ -98,16 +98,14 @@ usage:
     run as server : ./this_program -s -l server_listen_ip:server_port -r remote_address:remote_port  [options]
 
 common options,these options must be same on both side:
-    --raw-mode            <string>        available values:faketcp(default),udp,icmp and easy-faketcp
+    --raw-mode            <string>        avaliable values:faketcp(default),udp,icmp
     -k,--key              <string>        password to gen symetric key,default:"secret key"
-    --cipher-mode         <string>        available values:aes128cfb,aes128cbc(default),xor,none
+    --cipher-mode         <string>        avaliable values:aes128cbc(default),xor,none
-    --auth-mode           <string>        available values:hmac_sha1,md5(default),crc32,simple,none
+    --auth-mode           <string>        avaliable values:hmac_sha1,md5(default),crc32,simple,none
     -a,--auto-rule                        auto add (and delete) iptables rule
     -g,--gen-rule                         generate iptables rule then exit,so that you can copy and
                                           add it manually.overrides -a
     --disable-anti-replay                 disable anti-replay,not suggested
-    --fix-gro                             try to fix huge packet caused by GRO. this option is at an early stage.
-                                          make sure client and server are at same version.
 client options:
     --source-ip           <ip>            force source-ip for raw socket
     --source-port         <port>          force source-port for raw socket,tcp/udp only
@@ -123,7 +121,6 @@ other options:
     --disable-color                       disable log color
     --disable-bpf                         disable the kernel space filter,most time its not necessary
                                           unless you suspect there is a bug
-    --dev                 <string>        bind raw socket to a device, not necessary but improves performance
     --sock-buf            <number>        buf size for socket,>=10 and <=10240,unit:kbyte,default:1024
     --force-sock-buf                      bypass system limitation while setting sock-buf
     --seq-mode            <number>        seq increase mode for faketcp:
@@ -136,14 +133,11 @@ other options:
     --lower-level         <string>        send packets at OSI level 2, format:'if_name#dest_mac_adress'
                                           ie:'eth0#00:23:45:67:89:b9'.or try '--lower-level auto' to obtain
                                           the parameter automatically,specify it manually if 'auto' failed
-    --wait-lock                           wait for xtables lock while invoking iptables, need iptables v1.4.20+
     --gen-add                             generate iptables rule and add it permanently,then exit.overrides -g
     --keep-rule                           monitor iptables and auto re-add if necessary.implys -a
-    --hb-len              <number>        length of heart-beat packet, >=0 and <=1500
-    --mtu-warn            <number>        mtu warning threshold, unit:byte, default:1375
     --clear                               clear any iptables rules added by this program.overrides everything
-    --retry-on-error                      retry on error, allow to start udp2raw before network is initialized
     -h,--help                             print this help message
+
 ```
 
 ### Iptables rules,`-a` and `-g`

common.cpp

@@ -11,6 +11,7 @@
 
 #include <random>
 #include <cmath>
+#include <stdint.h>
 
 // static int random_number_fd=-1;
 int force_socket_buf = 0;
@@ -190,6 +191,8 @@ int address_t::from_sockaddr(sockaddr *addr, socklen_t slen) {
     return 0;
 }
 
+int g_randomize_local_addr = 0;
+static uint32_t g_lo_ip = 0x7f010001u;
 int address_t::new_connected_udp_fd() {
     int new_udp_fd;
     new_udp_fd = socket(get_type(), SOCK_DGRAM, IPPROTO_UDP);
@@ -200,6 +203,20 @@ int address_t::new_connected_udp_fd() {
     setnonblocking(new_udp_fd);
     set_buf_size(new_udp_fd, socket_buf_size);
 
+    struct sockaddr_in *paddr_inet = (struct sockaddr_in *)&inner;
+    if (paddr_inet->sin_family == AF_INET && g_randomize_local_addr && 
+    (ntohl(paddr_inet->sin_addr.s_addr) & 0xff000000u) == 0x7f000000u) {
+        // wireguard allows only one port number per address, so change source address on reconnection
+        struct sockaddr_in addr_bound;
+        memset(&addr_bound, 0, sizeof(addr_bound));
+        addr_bound.sin_family = AF_INET;
+        addr_bound.sin_addr.s_addr = htonl(g_lo_ip);
+        g_lo_ip += 0x2u;
+        mylog(log_debug, "randomizing local address when connecting to localhost, binding local ip %s\n", my_ntoa(g_lo_ip));
+        if (bind(new_udp_fd, (struct sockaddr *)&addr_bound, sizeof(addr_bound)) != 0) {
+            mylog(log_warn, "lo addr: bind failed\n");
+        }
+    }
     mylog(log_debug, "created new udp_fd %d\n", new_udp_fd);
     int ret = connect(new_udp_fd, (struct sockaddr *)&inner, get_len());
     if (ret != 0) {

common.h

@@ -163,6 +163,8 @@ extern int force_socket_buf;
 
 extern int g_fix_gro;
 
+extern int g_randomize_local_addr;
+
 /*
 struct ip_port_t
 {

doc/README.zh-cn.md

@@ -103,7 +103,7 @@ https://github.com/wangyu-/udp2raw-tunnel/releases
 ### 命令选项
 ```
 udp2raw-tunnel
-git version:4623f878e0    build date:Nov  3 2024 23:15:46
+git version:6e1df4b39f    build date:Oct 24 2017 09:21:15
 repository: https://github.com/wangyu-/udp2raw-tunnel
 
 usage:
@@ -111,16 +111,14 @@ usage:
     run as server : ./this_program -s -l server_listen_ip:server_port -r remote_address:remote_port  [options]
 
 common options,these options must be same on both side:
-    --raw-mode            <string>        available values:faketcp(default),udp,icmp and easy-faketcp
+    --raw-mode            <string>        available values:faketcp(default),udp,icmp
     -k,--key              <string>        password to gen symetric key,default:"secret key"
-    --cipher-mode         <string>        available values:aes128cfb,aes128cbc(default),xor,none
+    --cipher-mode         <string>        available values:aes128cbc(default),xor,none
     --auth-mode           <string>        available values:hmac_sha1,md5(default),crc32,simple,none
     -a,--auto-rule                        auto add (and delete) iptables rule
     -g,--gen-rule                         generate iptables rule then exit,so that you can copy and
                                           add it manually.overrides -a
     --disable-anti-replay                 disable anti-replay,not suggested
-    --fix-gro                             try to fix huge packet caused by GRO. this option is at an early stage.
-                                          make sure client and server are at same version.
 client options:
     --source-ip           <ip>            force source-ip for raw socket
     --source-port         <port>          force source-port for raw socket,tcp/udp only
@@ -136,7 +134,6 @@ other options:
     --disable-color                       disable log color
     --disable-bpf                         disable the kernel space filter,most time its not necessary
                                           unless you suspect there is a bug
-    --dev                 <string>        bind raw socket to a device, not necessary but improves performance
     --sock-buf            <number>        buf size for socket,>=10 and <=10240,unit:kbyte,default:1024
     --force-sock-buf                      bypass system limitation while setting sock-buf
     --seq-mode            <number>        seq increase mode for faketcp:
@@ -149,14 +146,11 @@ other options:
     --lower-level         <string>        send packets at OSI level 2, format:'if_name#dest_mac_adress'
                                           ie:'eth0#00:23:45:67:89:b9'.or try '--lower-level auto' to obtain
                                           the parameter automatically,specify it manually if 'auto' failed
-    --wait-lock                           wait for xtables lock while invoking iptables, need iptables v1.4.20+
     --gen-add                             generate iptables rule and add it permanently,then exit.overrides -g
     --keep-rule                           monitor iptables and auto re-add if necessary.implys -a
-    --hb-len              <number>        length of heart-beat packet, >=0 and <=1500
-    --mtu-warn            <number>        mtu warning threshold, unit:byte, default:1375
     --clear                               clear any iptables rules added by this program.overrides everything
-    --retry-on-error                      retry on error, allow to start udp2raw before network is initialized
     -h,--help                             print this help message
+
 ```
 
 ### iptables 规则,`-a`和`-g`
@@ -275,4 +269,3 @@ raw_mode: faketcp  cipher_mode: aes128cbc  auth_mode: md5
 
 https://github.com/wangyu-/udp2raw-tunnel/wiki
 
-

misc.cpp

@@ -296,6 +296,9 @@ void process_arg(int argc, char *argv[])  // process all options
             {"no-pcap-mutex", no_argument, 0, 1},
 #endif
             {"fix-gro", no_argument, 0, 1},
+            {"do-fragment", no_argument, 0, 1},
+            {"rand-addr", no_argument, 0, 1},
+            {"wireguard", no_argument, 0, 1},
             {NULL, 0, 0, 0}};
 
     process_log_level(argc, argv);
@@ -677,6 +680,16 @@ void process_arg(int argc, char *argv[])  // process all options
                 } else if (strcmp(long_options[option_index].name, "fix-gro") == 0) {
                     mylog(log_info, "--fix-gro enabled\n");
                     g_fix_gro = 1;
+                } else if (strcmp(long_options[option_index].name, "do-fragment") == 0) {
+                    mylog(log_info, "--do-fragment enabled\n");
+                    g_should_fragment = 1;
+                } else if (strcmp(long_options[option_index].name, "rand-addr") == 0) {
+                    mylog(log_info, "--rand-addr enabled\n");
+                    g_randomize_local_addr = 1;
+                } else if (strcmp(long_options[option_index].name, "wireguard") == 0) {
+                    mylog(log_info, "--wireguard mode enabled, turning on --do-fragment and --rand-addr\n");
+                    g_should_fragment = 1;
+                    g_randomize_local_addr = 1;
                 } else {
                     mylog(log_warn, "ignored unknown long option ,option_index:%d code:<%x>\n", option_index, optopt);
                 }

network.cpp

@@ -1159,6 +1159,7 @@ printf("pcap send!\n");*/
 }
 #endif
 
+int g_should_fragment = 0;
 int send_raw_ip(raw_info_t &raw_info, const char *payload, int payloadlen) {
     const packet_info_t &send_info = raw_info.send_info;
     const packet_info_t &recv_info = raw_info.recv_info;
@@ -1188,8 +1189,11 @@ int send_raw_ip(raw_info_t &raw_info, const char *payload, int payloadlen) {
             // iph->id = 0; //Id of this packet  ,kernel will auto fill this if id is zero  ,or really?????// todo //seems like there is a problem
         }
 
-        iph->frag_off = htons(0x4000);  // DF set,others are zero
+        if (g_should_fragment) {
-        // iph->frag_off = htons(0x0000); //DF set,others are zero
+            iph->frag_off = htons(0x0000);  //DF cleared,others are zero
+        } else {
+            iph->frag_off = htons(0x4000);  // DF set,others are zero
+        }
         iph->ttl = (unsigned char)ttl_value;
         iph->protocol = send_info.protocol;
         iph->check = 0;                        // Set to 0 before calculating checksum

network.h

@@ -56,6 +56,8 @@ struct icmphdr {
 };
 #endif
 
+extern int g_should_fragment;
+
 struct my_iphdr {
 #ifdef UDP2RAW_LITTLE_ENDIAN
     unsigned char ihl : 4;